How to add MEX endpoints programmatically

The Metadata Exchange Endpoint (MEX) is a special endpoint in WCF that exposes metadata used to describe a service.Without the MEX, you will not be able to use svcutil.exe to automatically generate a proxy class. Fortunately, it is a simply process to enable the MEX for your service. Here is the code which will add Mex endpoint programmatically.

var metadataBehavior = serviceHost.Description.Behaviors.Find<ServiceMetadataBehavior>()
    ?? new ServiceMetadataBehavior();
serviceHost.Description.Behaviors.Add(metadataBehavior);
serviceHost.AddServiceEndpoint(typeof(IMetadataExchange),
    MetadataExchangeBindings.CreateMexHttpBinding(),
    "http://localhost:8080/IService/Mex");

It should be noted that you are not required to enable HttpGet. SvcUtil will still be able to access the MEX without it. However, it is useful if you want to view the WSDL from a browser by going to the address of the service. You cannot do so without enabling the HttpGet.